<?php
/**
 * TbTabs class file.
 * @author Christoffer Niska <ChristofferNiska@gmail.com>
 * @copyright Copyright &copy; Christoffer Niska 2011-
 * @license http://www.opensource.org/licenses/bsd-license.php New BSD License
 * @package bootstrap.widgets
 */

Yii::import('bootstrap.widgets.TbMenu');

/**
 * Bootstrap Javascript tabs widget.
 * @see http://twitter.github.com/bootstrap/javascript.html#tabs
 */
class TbTabs extends CWidget
{
    // Tab placements.
    const PLACEMENT_ABOVE = 'above';
    const PLACEMENT_BELOW = 'below';
    const PLACEMENT_LEFT = 'left';
    const PLACEMENT_RIGHT = 'right';

    /**
     * @var string the type of tabs to display. Defaults to 'tabs'. Valid values are 'tabs' and 'pills'.
     * Please not that Javascript pills are not fully supported in Bootstrap yet!
     * @see TbMenu::$type
     */
    public $type = TbMenu::TYPE_TABS;
    /**
     * @var string the placement of the tabs.
     * Valid values are 'above', 'below', 'left' and 'right'.
     */
    public $placement;
    /**
     * @var array the tab configuration.
     */
    public $tabs = array();
    /**
     * @var boolean whether to encode item labels.
     */
    public $encodeLabel = true;
    /**
     * @var string[] the Javascript event handlers.
     */
    public $events = array();
    /**
     * @var array the HTML attributes for the widget container.
     */
    public $htmlOptions = array();

    /**
     * Initializes the widget.
     */
    public function init()
    {
        if (!isset($this->htmlOptions['id']))
            $this->htmlOptions['id'] = $this->getId();

        $classes = array();

        $validPlacements = array(self::PLACEMENT_ABOVE, self::PLACEMENT_BELOW, self::PLACEMENT_LEFT, self::PLACEMENT_RIGHT);

        if (isset($this->placement) && in_array($this->placement, $validPlacements))
            $classes[] = 'tabs-' . $this->placement;

        if (!empty($classes)) {
            $classes = implode(' ', $classes);
            if (isset($this->htmlOptions['class']))
                $this->htmlOptions['class'] .= ' ' . $classes;
            else
                $this->htmlOptions['class'] = $classes;
        }
    }

    /**
     * Run this widget.
     */
    public function run()
    {
        $id = $this->id;
        $content = array();
        $items = $this->normalizeTabs($this->tabs, $content);

        ob_start();
        $this->controller->widget('bootstrap.widgets.TbMenu', array(
            'type' => $this->type,
            'encodeLabel' => $this->encodeLabel,
            'items' => $items,
        ));
        $tabs = ob_get_clean();

        ob_start();
        echo '<div class="tab-content">';
        echo implode('', $content);
        echo '</div>';
        $content = ob_get_clean();

        echo CHtml::openTag('div', $this->htmlOptions);
        echo $this->placement === self::PLACEMENT_BELOW ? $content . $tabs : $tabs . $content;
        echo '</div>';

        /** @var CClientScript $cs */
        $cs = Yii::app()->getClientScript();
        $cs->registerScript(__CLASS__ . '#' . $id, "jQuery('#{$id}').tab('show');");

        foreach ($this->events as $name => $handler) {
            $handler = CJavaScript::encode($handler);
            $cs->registerScript(__CLASS__ . '#' . $id . '_' . $name, "jQuery('#{$id}').on('{$name}', {$handler});");
        }
    }

    /**
     * Normalizes the tab configuration.
     * @param array $tabs the tab configuration
     * @param array $panes a reference to the panes array
     * @param integer $i the current index
     * @return array the items
     */
    protected function normalizeTabs($tabs, &$panes, &$i = 0)
    {
        $id = $this->getId();
        $items = array();

        foreach ($tabs as $tab) {
            $item = $tab;

            if (isset($item['visible']) && $item['visible'] === false)
                continue;

            if (!isset($item['itemOptions']))
                $item['itemOptions'] = array();

            $item['linkOptions']['data-toggle'] = 'tab';

            if (isset($tab['items']))
                $item['items'] = $this->normalizeTabs($item['items'], $panes, $i);
            else {
                if (!isset($item['id']))
                    $item['id'] = $id . '_tab_' . ($i + 1);

                $item['url'] = '#' . $item['id'];

                if (!isset($item['content']))
                    $item['content'] = '';

                $content = $item['content'];
                unset($item['content']);

                if (!isset($item['paneOptions']))
                    $item['paneOptions'] = array();

                $paneOptions = $item['paneOptions'];
                unset($item['paneOptions']);

                $paneOptions['id'] = $item['id'];

                $classes = array('tab-pane fade');

                if (isset($item['active']) && $item['active'])
                    $classes[] = 'active in';

                $classes = implode(' ', $classes);
                if (isset($paneOptions['class']))
                    $paneOptions['class'] .= ' ' . $classes;
                else
                    $paneOptions['class'] = $classes;

                $panes[] = CHtml::tag('div', $paneOptions, $content);

                $i++; // increment the tab-index
            }

            $items[] = $item;
        }

        return $items;
    }
}
